Flat Oot like a ducks Foot
I'm old so say stick with silver.
Think its Simonize do a "5 wheel silver" tin of paint that should do the job.
As previously mentioned, Take your time, sand them down & fill the deep gouges with filler & re-sand.
A coat of primer, silver on top & 2-3 coats of laquer.
I've done a few in the past & they come up nice.
If you buy a few tins of the same silver, its easy to re fill & match if you kerb them again.
Handy for me with the missus driving! if they were left in her hands without touching up, I could saw timber with them after 6 months!